Sterling HS - Manual (Page 12)

12
INSTALLATION
UNIT MOUNTING
Install unit heaters to meet Occupational Safety and
Health Act (OSHA) and ETL requirements. Unit heaters
mounted lower than 8 feet (2.4m) from the fl oor must be
equipped with an OSHA fan guard.
NOTICE: Units equipped with the motor mounted to
the fan guard require two point suspension. Units
equipped with a shelf mounted motor are required to
be suspended at four points. Refer to Figures 3 and
4 for two point suspension and refer to Figure 6A for
four point suspension.
Unit heaters must be hung level
from side to side and from front to back. Failure
to do so will result in poor performance and/or
premature failure of the unit.
Make certain that the lifting
methods used to lift the heater and the method
of suspension used in the fi eld installation of the
heater are capable of uniformly supporting the
weight of the heater at all times. Failure to heed
this warning may result in property damage or
personal injury!
Insure that all hardware used in
the suspension of each unit heater is more than
adequate for the job. Failure to do so may result
in extensive property damage, severe personal
injury, or death!
Make sure that the structure
to which the unit heater is to be mounted is
capable of safely supporting its weight. Under
no circumstances must the water lines or
the electrical conduit be used to support the
heater; or should any other objects (i.e. ladder,
person) lean against the heater water lines or
the electrical conduit for support. Failure to
heed these warnings may result in property
damage, personal injury, or death.
Nutserts are provided at the top of all units for
suspension purposes. Support rods should support
the total unit weight to assure that no strain is placed
on supply and return piping. Provisions for removal of
the unit from the suspension rods may be desirable for
servicing purposes.
Units must hang level vertically and horizontally.
Provide suffi cient clearance around units for maintenance
purposes.
Isolators are not required but may be desirable for some
applications. Refer to “Dimensional Data” in Tables 1
and 2.
PIPING
To provide proper coil operation, follow all piping
recommendations listed in this manual.
See Figures 7 through 11 for proper pipe connections.
Follow standard practices and codes when installing
the piping. Provide swing joints for expansion purposes,
unions and shut-off valves for servicing purposes and as
illustrated in Figures 7 through 11, valves and traps for
control purposes. Use 45 degree angle run-offs from all
supply and return mains.
Dirt pockets should be the same pipe size as the return
tapping of the unit heater. Also, pipe size in the branch-
off should be the same size as the tapping in the traps.
Beyond the trap, the return lateral pipe should be
increased one size up to the return main.
It is assumed that the design engineer has selected the
type of system to be used. The sketches shown are for
different types of steam systems or hot water systems.
For sizing of piping, traps, fi lter, etc., consult ASHRAE
guides of the manufacturer’s literature on these products.
It is important that the system be kept clean. Care should
be exercised that excessive joint materials or foreign
substances be kept out of the system.
On steam systems it is recommended that the unit
be installed level for proper condensate drainage.
Swing joints should be used in piping, and pipes should
be pitched down from units so that condensate can
drain freely.